Multicellular Primary Producers Seaweeds and Plants Multicellular Algae

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Multicellular Primary Producers: Seaweeds and Plants

Multicellular Primary Producers: Seaweeds and Plants

Multicellular Algae: The Seaweeds • Macrophytes or macroalgae • Multicellular, eukaryotic organisms • There

Multicellular Algae: The Seaweeds • Macrophytes or macroalgae • Multicellular, eukaryotic organisms • There are 3 types of seaweeds; • green • brown • red algae

General Structure of Seaweeds • Body of seaweed (thallus) • Leaf-like portions (blades) o

General Structure of Seaweeds • Body of seaweed (thallus) • Leaf-like portions (blades) o photosynthesis o Gas-filled bladders (pneumatocysts) • Stem-like structure that provides support (stipe) • Attaches the thallus to the bottom (holdfast)

Fig. 6. 1

Fig. 6. 1

• Green Algae Division Chlorophyta o Freshwater o Marine o Terrestrial o Bright

• Green Algae Division Chlorophyta o Freshwater o Marine o Terrestrial o Bright green from chlorophyll Ulva or sea lettuce

Codium

Codium

Brown Algae Division Phaeophyta o. Yellow-brown pigment, fucoxanthin o. Temperate/polar o. Rocky coast o.

Brown Algae Division Phaeophyta o. Yellow-brown pigment, fucoxanthin o. Temperate/polar o. Rocky coast o. Largest/complex Fucus, rockweed

Kelp • Largest of all brown algae • Macrocystis o Largest of the kelp

Kelp • Largest of all brown algae • Macrocystis o Largest of the kelp o Grow 20 in a day • Kelp beds are rich in life, most productive

Red Algae Division Rhodophyta • Highest number of species • Red pigments; phycobilins •

Red Algae Division Rhodophyta • Highest number of species • Red pigments; phycobilins • Parasite for other seaweed • Porphyra, rocky shores

Coralline alga • calcium carbonate in their cell walls.

Coralline alga • calcium carbonate in their cell walls.

Life History • Reproduction • asexual and sexual • alternation of haploid and diploid

Life History • Reproduction • asexual and sexual • alternation of haploid and diploid generation

Economic Importance • Mariculture • Thick suspensions or gels at low concentrations (algin, carrageenan,

Economic Importance • Mariculture • Thick suspensions or gels at low concentrations (algin, carrageenan, and agar) • Dairy products such as ice cream and cheese • Frosting, Rx, shampoo, shaving cream, rubber products, paints, and cosmetics.

Flowering Plants • Seagrasses • true marine species adapted to soft-bottom coastal regions •

Flowering Plants • Seagrasses • true marine species adapted to soft-bottom coastal regions • Members of the lily family evolved from terrestrial plants

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